Hi anyone know about bone cyst? My son who was age nine at the time fractured his left distal tibia. When they xray'd it they said he had some boney cyst so they sent him for an mri....The mri states that its probably a bone cyst with multiple components its fluid filled and possible benign. This cyst is on the inside of his bone. They say it could be an enchondroma. My son is now almost 12 and he is doing much better and he denys any pain. The cyst is said to be 7cm long by 1.8 across